| 摘要 |
A double-eccentric variable drive system is disclosed comprising a drive shaft, two eccentrics mounted on the drive shaft to be driven thereby, and means for varying the eccentricity of both of the eccentrics simultaneously. The means in question comprises a spindle having left-hand screw-threads on one end thereof and right-hand screw-threads on the other end thereof and an enlarged central portion rotatably mounted in the shaft but radially fixed relative thereto. The eccentrics each have a radial bore therethrough tapped to correspond with and receive the threads of the spindle, the bores being aligned on opposite sides of the shaft. Each eccentric has an axial bore larger than the diameter of the shaft in a direction parallel to the spindle to allow for movement of the eccentrics radially of the shaft. The arrangement is such that rotation of said spindle in one direction will simultaneously increase the eccentricity of both of the eccentrics relative to the shaft and rotation of the spindle in the other direction will simultaneously decrease the eccentricity of both of the eccentrics relative to the shaft. Preferably, the eccentrics each have a dovetail slide and a diametrically opposite dovetail, the dovetail of one eccentric slidably engaging in the dovetail slide of the other eccentric and vice versa, each dovetail having said radial bore passing therethrough. The system is particularly adapted for use in solvent extraction.
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